Single-source instructions need their source spec to be in the the top 4
bits of the source/dest spec, and it was incorrectly being set in the
bottom 4 bits. This affected jump instructions, as they would
be reading the instruction at the given address rather than jumping
to it.
Signed-off-by: Alek Ratzloff <alekratz@gmail.com>
Most everything works, but there's one small bug with the execution
involving jumps - still have to figure that one out.
Signed-off-by: Alek Ratzloff <alekratz@gmail.com>
